using System;
using System.Collections.Generic;
using System.Text;
using System.Collections;
using FastReport.Utils;

namespace FastReport.Data
{
    /// <summary>
    /// Represents the collection of <see cref="Relation"/> objects.
    /// </summary>
    public class RelationCollection : FRCollectionBase
    {
        /// <summary>
        /// Gets or sets a relation.
        /// </summary>
        /// <param name="index">The index of a relation in this collection.</param>
        /// <returns>The relation with specified index.</returns>
        public Relation this[int index]
        {
            get { return List[index] as Relation; }
            set { List[index] = value; }
        }

        /// <summary>
        /// Finds a relation by its name.
        /// </summary>
        /// <param name="name">The name of a relation.</param>
        /// <returns>The <see cref="Relation"/> object if found; otherwise <b>null</b>.</returns>
        public Relation FindByName(string name)
        {
            foreach (Relation c in this)
            {
                if (c.Name == name)
                    return c;
            }
            return null;
        }

        /// <summary>
        /// Finds a relation by its alias.
        /// </summary>
        /// <param name="alias">The alias of a relation.</param>
        /// <returns>The <see cref="Relation"/> object if found; otherwise <b>null</b>.</returns>
        public Relation FindByAlias(string alias)
        {
            foreach (Relation c in this)
            {
                if (c.Alias == alias)
                    return c;
            }
            return null;
        }

        /// <summary>
        /// Finds a relation that is equal to specified one.
        /// </summary>
        /// <param name="rel">Another relation to compare with.</param>
        /// <returns>The <see cref="Relation"/> object if found; otherwise <b>null</b>.</returns>
        public Relation FindEqual(Relation rel)
        {
            foreach (Relation c in this)
            {
                if (c.Equals(rel))
                    return c;
            }
            return null;
        }

        /// <summary>
        /// Initializes a new instance of the <see cref="RelationCollection"/> class with default settings.
        /// </summary>
        /// <param name="owner">The owner of this collection.</param>
        public RelationCollection(Base owner) : base(owner)
        {
        }
    }
}
